Tamping tool



G. KOHLER...

TAMPING TOOL. APFLICATION FILED MAR- 5, I92].

. 1,420, 9 '7 .PatentdJune20,1922;

GUTTFB-ID KOHLER, OF BRIDGEPORT, CONNECTICUT, ASSIGNUE T0 GINGHEXPANSION BGLT & ENGINEERING COIwTPANY. OF NEW] YORK, N. 351, ACORPORATION OF NEWH YORK.-

aniac.

Application filed. March 5, 1921.

To all whom. it may concern Be it known that I, Go'rrrsm Return, acitizen of the United States, and resident of the city of Bridgeport,county of Fairlield, State of Connecticut, have invented certain new anduseful Improvements in Tamping Tools, of which the following is adescrip tion.

The present invention relates to improvements in tools for use inconnection with-bolt anchors of the type wherein the bolt engagingmember is formed of hard metal and constitutes a male part which isadapted to expand a female part of soft metal so that the latter iscaused to bind on the surrounding wall of a socket usually one formed inceramic or cementitious material and to which it is proposed to secure abolt.

The general object of the invention is to combine in a single tool foruse in fastening bolt anchors, the properties of the several toolshitherto employed for that purpose and which usually consisted of amandrel adapted to engage the anchor, a hammer or tamping tool withwhich to strike the female member and thereby cause the same to ex pandand a wrench or the like for disengaging the mandrel after effecting thelocking of the anchor in position.

The use of these several tools has been cumbersome and unsatisfactorybecause of the time required in effecting a number of adjustments andremovals which the use of several tools obviously required andadditionally, because of the increased weight which the several toolsgave to the workmens kit and the expense incident to re placement of oneor more of the-tools in the event of loss thereof.

To this end the invention resides-in combining the properties of amandrel and a hammer or tamping device in single tool, the hammer beingadapted to move-into and out of a bolt receiving socket and therebyapply blows to the female member disposed therein. The mandrel operatingin the ordinary manneruloy extending through the female member toprevent contraction of the opening thereof by the blows'of'the hammerand further operatingto engage the male member and thereby function as aguide for the hammer and lock for the tool in order to permit of rapidlyoperating the hammer. The invention further residing in adapting thehammer and mandrel to cooperate and Specification of Letters Patent.

respect to the said socket. stitutes the female part of the anchor andthecontour 10 thereof is enlarged with respect to the bore 7 of the part5 sufficiently so as to initially. receive a small portion of TAMPINGTOOL.

Patented June 2%, 1922,

Serial No. M9327.

permit easy detachment of the tool after the fastening of the anchor.

Other objects will appear. and be better understood from that embodimentof the invention of which the following is a specification, referencebeing had to the accompaying drawings forming part thereof and in which:

Figure l is a side elevation of the complete invention.

Figure 2 is a vertical cross-section on the line 22 of Figure 1.

Figure 3 is a side elevation of the device in use.

The device of the present invention is primarily intended for use inconnection with a well known form of bolt anchor consisting ofthe parts5 and 6 as shown in Figure 3. These parts are of metal. The part 5 isformed of relatively hard metal and is pro vided with an axial screwthreaded bore 7 which engages the screw threaded shank of the bolt (notshown) to be secured. The part 6 is formed of relatively soft metal such.as lead and has a smooth axial bore through which the screw threadedshank of the bolt passes prior to being engaged by the part 5. The part5 has an outer surface that slopes toward one end of the part so thatthe same is substantially that of a truncated cone. This part 5constitutes the male part of the anchor. The outer surface of the part 6.slopes like the outer surface of the part 5 except that when the partsare arranged in operatlve posltlon as shown in Figure 3, the

sloping of the part 6 is inward with respect to the direction ofexpansion of the socket 8 in the wall or other body 9 and the sloping ofthe surface of the part 5 is outward with The part 6 conthe taperedouter end of the part 5. The crosssectional area of the socket 8 is suchthat the parts 5 and 6 may be readily inserted there-into and when soinserted, the outer or female part is tamped or hammered and the forceof this action results in forcing the part 5 into the part 6 so that thesame is expanded thereby in addition to the expansion which the part 6receives from the blows directed on its outer end.

The tool of the present invention is deindicated by 12 and is of a sizeto engage the screw threads of the screw threaded bore 7 of the part 5,the length of the reduced end portion 12 conforming substantially to thelength of the bore 7. The length of the mandrel is such that it willextend for an appreciable distance beyond the outer end of the socketwhen engaged with the part 5 as just described. A tamping device orhammer 13 has a longitudinal socket 14 which loosely receives themandrel 1.1. The

length or depth of the socket corresponds approximately to the length ofthe mandrel 11 and the cross-sectional area of the tamping device withrespect to the socket 8 is such as to permit of the said tamping devicebeing readily moved into and out of the socket and into and out ofengagement with'the member 6. In order that the parts of the tool may beheld assembled at all times, a pin and slot construction or itsequivalent, is provided. In the present instance I have shown a pin 15disposed in a transverse opening in the outer end portion of the mandrel11 with respect to the position thereof as shown in Figure 3. Theopposite ends of the pin project beyond opposite portions of the mandreland are disposed in oppositely arranged slots 16 and 17 in the wall ofthe tamping device or hammer 13. This structure, it will be observed,limits the stroke of the tamping device or hammer and at the same timeprovides for the turning of the mandrel and the tamping device or hammeras a unit.

From the foregoing, the operation of the device will be clearlyunderstood, it being obvious that when the parts 5 and 6 are arran ed asshown in Figure 3 and the screw threaded end portion 12 of the mandrelscrewed into the bore of the part 5, the tamping device or hammer 13 maybe readily reciprocated on the mandrel 11. The tamping device or hammeron each instroke thereof will strike the part 6 causing the upper endthereof to expand laterally and forcing the lower end farther upon thepart 5 with the result that the outer surface of the part 6 will beforced into binding contact with the wall of the socket 8. Incrushing'the part 6 to effect the expansion thereof, it will be observedthat the action of the tamping device or hammer does not effect areduction in the size of the bore 10. This, of course, is due to thepresence therein of the mandrel 11. The portion of the mandrel disposedin the bore 10 is cylindrical so that after the part 6 has been crushedby the tamping device or hammer the degree of contact, if any. betweenthe bore 10 and adjacent surface of the mandrel will not be such as toprevent ready turning of the mandrel to disengage the same from the part5. In order to facilitate this turning of the tool to be unscrewed fromthe part 5, the outer end portion of the tamping device or hammer isknurled as indicated by 15, the lrnurling extending over a suflicientportion of the surface of the tamping device or hammer so that ahand-hold is provided to prevent slipping of the hand of the operator inthe operation of disengaging the mandrel from the part 5.

The mandrel 11 may be formed of any material found suitable for thepurpose and be of any required contour and length. As shown, the mandrel11 is formed of a single piece of steel and is cylindrical throughout.The tamping device or hammer may also be formed of any material foundsuitable for the purpose and the bore 14 thereof formed by drillingthrough the body from one end thereof and for a distance conformingsubstantially t0 the length of the mandrel. In the present instance Ihave shown the tamping device or hammer as being formed of a singlepiece of steel slots 16 and 17 being out therein and of such length aswill permit of a stroke on the part of the tamping device or hammer ofsufficient length to be effective on the part 6.

Although I have shown and described an ideal embodiment of my invention,it is to be understood that I am not to be limited to the details ofconstruction therein shown and I reserve the right to make such. changesas may fairly come within the scope of the claims, without departingfrom the spirit or sacrificing any of the ideas of the invention.

I claim:

1. A tool comprising a mandrel having a screw threaded end portionadapted to be screwed into the. screw threaded bore of the male part ofa bolt anchor and further having a cylindrical portion disposed abovethe screw threaded portion, a tamping device slidingly mounted on themandrel and adapted, when reciprocated, to strike and crush the softmetallic female part of the anchor surrounding the cylindrical portionof the mandrel and one end portion of the male part.

2. A tool comprising a mandrel having a reduced screw threaded endportion adapted to be screwed into the screw threaded bore of the malepart of a bolt anchor and further having a cylindrical portion disposedabove the screw threaded portion, a tamping

